Pipe mitering machine



Jan. 24,1950 w, NG" 2,495,360

I PIPE MITERING MACHINE Filed Nov. 25, 1945 2 Sheets-Sheet 1 I I I l INVENTOR POSlTlON-A POSlTiON-B POSITION-CJ JLLOYD W.YOUNG f M. ATTORNEY L. W. YOUNG PIPE MITERING MACHINE Jan. 24, 1950 2 Sheets- Sheet 2 I Filed Nov. .25, 1945 INVENTOR LLOYD W. YOUNG 1 '1 ATTORNEY Patented Jan. 24, 1950 P zaFFil CiE BIBEMI TERINGTMAGHINE "LloydWfiYoung,iElizabethfN. 'J.;as'signor 'tof'lhe Linde AirTroducts Company, a-eorporatiomof 'Ohio Application November 23, 1945, Serial No. 630,442

14Glaims.

.1 .This invention relates .{tOfbPlp mitering 'machines, and .more particularly to, a 'blowpipe machine :provided with ,automaticmmeans {for continuouslyvarying' the, positionof th cuttingblowv,pipe...durin g..r,elativ,e r.otation of the pipe being ,cut. .This .variation o'f;,position maybe only 'in :the directionlongitudinally of-AaheDipe' f or.a miter 1011i), or.it1may comprise continuously varying the angle of the cutting'blowpipeline longitudinal .axial ,plane ,with .respect 'tofthepipe" being cut, in

i order Lto .pro.duce' a lmitered an'dlbeveled pipe end .correctly prepared 'forwelding.

.In .forming an telhowoby .wellding-mitered ends of pipe together, various pipe .sentions ,are re- .guired dependinguponithe uniformityofiflowldesiredthrough the elbow. Withthesamaangle, of bend, ior, example 903,; an .elbow iormedof two cmitered sections .havingpnly one weld willpfier :some ,resistance ,to ow, .whereasif ..the,elbowj.is .iormed .of several .mitered -sections welded ,.totgether at their edges J20 complete jthe .bend, the :restrictiomtothe flow of fluidcaround the ben'ctis greatlyreduced. Such, elbows or hands madeu of several welded .mitered ,sectionsrequire extreme accuracy in preparation. Furthermore, in order to ,provide v.a iuniform groove .for .welding around the .enti1-:e. cir,cumference ,ofathe ,pipe, .the,.angle.of :bevel .for .the cutting blow-pipemithgrespect tothe ,.,suriace-of,-the pipe must he made-t0 varypontin- .uouslythroughoutithepu ,It .is therefore .themain robject .of .this inven- Jim .to provideimechanism .iorgraduallychang- ;in g .the inclination .of rasblowpipe no zzle, in. a longitudinal .plane .containing .the :axis of ,the pipe tduringzrelative rotation oLthepipeandthe, blowpipe mozzlexabout zthe pipe axis whilesutting .the ,i

Pipe miterin andbevelinggnachines heretofore ,-proposed.haue been complex-in construction and adjustment, not i1sua:1ly;=portab1e, rand havebeen icostly. For. thesereasons alargepartof mitered and beveled pipe ends have been flame out by .hand.

.aI-tis therefore a :furthwersobieot .-,0f iihe present .iaudiust and-nominate gestation.

Another object of .this invention :is to gorovigzle son improvedimaohme aut ma icallyiaev lin IIZhe above-end .ot lr-nlzieots-las uell as novel 1 features of this invention will be apparent'ifrom "the following; description *ta'ken with' the' accompanyingdrawings,:in"which:

"Fig.1 ,is a fdetailei'lg-perspective ,viewof 'apre- 'ferred embodiment :o'f" the present invention Fig; 2 is a 'diagram gof'the 'mitered sections "of j pipeito be'wldedto iorman telbow.

"Fig. 3 is a schematic "diagram showing three .differently inclined ,positions of a cutting "blow- ,pipe nozzle: at points taroun'd a 'mitered end" edge of a .pipe;.;'and

' Figs. '4, 5, and'G *arediagrams of modifications.

As shown in Fig.1, the pipe P is'suppiorted upon pairs 'of rollers B, one roller of which may be rotated by amo'tor "'Mf'f'or icausin'g rotation of theLpipe P aboutits longitudinal axis. A frame .F is mounted above'the pipe and supports a pair of .trac'ksT which extend .longitudinallyJof the pipe. (A carriageKiis provided with wheels'W rolling on :the'trackT. A blowpipe"S'is;pivoted on the carriageg'K for swinging :in a longitudinal plane containingthe'axispf the pipe, .to'va'rythe inclination of the "bl'owpipe nozzle "Nias the pipe is. severed, to ,produce a mitered and loeveledend edge.

Qwith. The traction drive roller' D'isjn rolling'enagement with'the underside of a disc 'E ij'ou'r- ,naled in the frame?! .on an axis radialltothepipe.

jRig'idwith the disc Eis acrarik G which engages aslo'tted'scotch yokeIHrig'id with the carriagejK ;'for moving the same along the track T. .A secon'dcrank lismounted on the first-crank 1G ,and'engagesa secondZScotch yoke J which is lon- ,gitudinally vslidable ,on .the carriage K, and is pivoted to a connecting rod L in turn pivote'dito .theholder. of .the vlblowpipe S.

As the ,pipewisirotated .by the roller 'R driven .by ,the .motor M, .;the Itractionflrive roller 'D. is

' ,rotated'by -;the pipe,,-.and;drives,the discE which .turns the.crank.lG,, wl'iich through the 'Scotohyoke 5 nnventioneto ,gBIOMldB reportable .machlneeof thi 4 ,JH moves .the carriage K and thereby .moves .the blowpipe S. longitudinally to .efiec't the miter out. "At the same time, -thesecond crank .Lturns with the crank G andithroughthe secondscotchyoke .J and connecting.;i:odfL moves the blowpipeS .aboutiits pivot .to gradually change the inclina- }.tion of its .nozzlei-Nrin a longitudinal v.plane and -effect the. swinging-bevelpf the pipe edge.

The frame F compr-ises a pair of :parallel guide v.rods .li) on which ,is .slidably mounted a :bridge member J2, which is longitudinally positioned by .rneans -:of .an iarzljusting .sorew J3. .The-traction .Qdrive -,ro1le r ;D,,isgpreferably. constructed of resilicut material with a friction surface and is journaled on the screw [3 within the bridge [2. The drive roll D is positioned with respect to the axis of the disc E in accordance with the diameter of the pipe being cut, so that the rotation of the disc E with respect to the rotation of the pipe P is a one to one ratio. A scale I4 on the frame F cooperates with a pointer I5 on the bridge 12 to facilitate this adjustment, and may be calibrated direct in pipe diameters.

The frame F is pivotally mounted on two vertical posts l6 by means of vertically adjustable clamping sleeves ll, which permit adjustment to different diameters of pipe, with sufficient clearance to cause the weight of the frame to bear on the traction drive roller D and provide sufficient traction to prevent slippage.

The disc E has a spindle journaled in a bearing 2| secured to the frame F below the disc.

The spindle 20 also extends above the disc and is provided with a clamping sleeve 22 in whichthe arm of crank G is slidably adjusted. The crank G has a crank pin 23 which rides in the slot 24 of the Scotch yoke H, which is rigid with the carriage K, preferably attached to the ends of parallel bars 25 having legs 26 secured to the carriage.

The crank G has a depending pointer 27, which cooperates with a scale 28 on the disc E. This scale is calibrated directly in mitered angles for respective pipe sizes.

The crank pin 23 has at its upper end a clamp- I ing sleeve 30 parallel to the arm of crank G, and

in which is slidably adjustably mounted the arm of the second crank I. The second crank I has a crank pin 3| which rides in the slot 32 of the Scotch yoke J, which is carried by guide rods 33 slidable in sleeve bearings 34 mounted on the carriage K, preferably in arms 35 extending upward from the bars 25. The arm of crank I is provided with a scale calibrated directly in degrees of angle of bevel.

The connecting rod L is pivotally connected at one end to the yoke J as at 36, and the other end thereof is pivotally connected as at 31 to the holder 38 for the blowpipe S, in which the blowpipe is longitudinally adjustable by means of a handwheel 39. The blowpipe holder 38 is mounted in a cradle comprisin an inverted V-shaped. member 40, pivoted as at 42 to the ends of stems 43 vertically adjustable in sleeves 44 mounted at the ends of parallel bars 45 rigidly secured to the carriage K and. extending therefrom longitudinally of the pipe. The sleeves 44 permit adjustment to pivot th blowpipe about a point which is in alignment with the inside wall of the pipe.

Apparatus embodying this invention is particularly useful in accurately mitering, or both mitering and beveling several pipe sections needed to form an elbow. The mitered and beveled end edges of several sections are assembled in appropriate relation to provide circumferential grooves to receive weld metal for uniting the sections end to end, as shown in Fig. 2. As here shown, the point A is on the inside of the bend, the point C is on the outside of the bend, and the point B is at th center or median position. As shown in Fig. 3, position B is the only one in which the blowpipe is inclined at the actual angle of bevel. In position A the angle between the blowpipe and the pipe axis is the remainder of the angle of bevel minus the angle of miter, while in position C the angle between the blowpipe and the pipe axis is the total of the angle 4 of bevel plus the angle of miter. The intermediate positions are gradually changing, in order to have a constant angle of V-groove cross-section formed by the mating edges of adjacent pipe edges for the welding operation.

It should be noted that the beveling mechanism may be locked in fixed position so as to produce only a simple unbeveled miter cut. The crank arm I may be removed and the guide rods 33 clamped in fixed position by adjustable set screws 48 in the opposite guide sleeves 34, to set the blowpipe in fixed position radial to the pipe to produce a miter out having a square or unbeveled edge.

It is stated hereinbefore that in Fig. 3 position B is the only position in which the blowpipe is inclined at the actual angle of bevel. This is true-the blowpipe is inclined at the actual angle of bevel at position B. However, the blowpipe centerline is also parallel with the axis of the pipe, not normal to the angle of miter. Bevels are always measured normal to the angle of miter. This condition causes an error in the angle of bevel at position B; e. g., when the machine is set up to cut a 45 degree miter and the included angle of bevel is 30 degrees, this included angle will be had only at positions A and C and the actual included angle of bevel at B will be approximately 21 degrees.

In order to correct this error, the blowpipe must be inclined at an angle greater than that of the angle of bevel at B. This error in angle of bevel at B may be corrected in a number of ways shown in Figs. 4, 5, and 6.

Referring to Fig. 4, the tie rod L is slidably supported by a sleeve bearing 49 and connected to the member 40 by a link 41 pivoted by a pin 50 to the tie rod L, which is shown in three positions corresponding to the three positions A, B, and C on the pipe. Position B is midway between positions A and C, as shown at b and 0" while the movement of the blowpipe yoke 40 is less for a given travel at b as shown at d and greater for a given travel at C as shown at Me.

An alternative arrangement is shown in Fig. 5 wherein compensation is had by making the slot 48 in Scotch yoke J in the form of a V. The angle of this V slot will determine the amount of compensation or increase angle of bevel at B. The three positions of crank pin 3| correspond to positions A, B and C of the pipe. Inclining the slot 32 in Scotch yoke J, either side of center as shown, will decrease the travel of the Scotch yoke J and tie rod L for the first degrees rotation of crank pin 3| from A to B' as shown at d. Rotation of crank pin 3! from 90 to degree (B to C) will increase the travel of the Scotch yoke as shown at e and the overall travel of the Scotch yoke will be equal to the total distance traveled by crank pin 3| from A to C.

An alternative arrangement is shown in Fig. 6 wherein compensation is had by pivotally attaching tie rod L directly to pin 3| and providing a universal joint 52 at the forward end of tie rod L to provide movement in two planes. Position B is midway between positions A and C as shown at b and 0 while the movement of the blowpipe yoke 40, attached to the universal joint 52 at the forward end of tie rod L, will be less for a given travel at b as shown at d and greater for a given travel at c as shown at ell. v

enounce 'What is-iclai'med is: 1 1. Apparatus for.cuttingm'waryingganglebevel in pipe, comprising meansfor supp'ortingr-aiblow- "pipe nozzle and the ---pipe to the cutfifor relative rotation about the longitudinalaaxis o'f ithe -:pipe, .4;

f-in a longitudinal plane -'-with' respect to the pipe during such relative rotation to maintain aa -con- 'sta-nt' angle -of 'bevel measured perpendicular to said-miter cut.

"2. -=lln a-pipe mitering machine, means for supporting a blowpipe nozzle and the "111138 being out for relative V rotation about the lon'gitu'dinal of -the pipe, 'mean's for causing -relative -longitudinal movement of said nozzle and pipe *during said relative rotation to cause a miter cut in the pipe, anlactuatorldrivlenlin timed relation to such relative rotation, a link driven by said actuator and connected 2120 the blowpipe, and a coupling interposed between .saidiactuator land blowpipeiandeconnected .toesaidhlinkjfor gradually changing the inclination of said blowpipe nozzle in a longitudinal plane with-respect to thegpipe being cut' to-provida a swinging bevel edge 'for said miter 1 out.

' Apparatus-ior'cuttinga Varying angledoevel :in pipe, comprising --means *for causing :relative rotation-of a blowpipe nozzle and the p'ipabeing cu't, ran attuatbr-rotated-in timed relatiomto'said relative rotation of said "nozzle "and pipeymeans responsive "to said actuator for causing "relative longitudinal imovement f --said :nozzle and pipe during said relative rotation, a link driven by said: actuator and connected'to the blow-pipe, and "a coupling interposed-between -said actuator and blowpipe and connected to said link changing the inclination of said nozzle during said relative rotation and said relative longitudinal movement to maintain a constant angle of bevel measured perpendicular to the cut.

4. Apparatus for cutting a varying angle bevel in pipe, comprising means for causing relative rotation of a blowpipe nozzle and the pipe being cut, an actuator rotated in timed relation to said relative rotation of said nozzle and pipe, means responsive to said actuator for causing relative longitudinal movement of said nozzle and pipe during said relative rotation, and a Scotch yoke having a chevron slot engaged by said actuator for gradually changing the inclination of said nozzle during said relative rotation and relative longitudinal movement.

5. Apparatus for cutting a varying angle bevel in pipe, comprising a carriage movable longitudinally of said pipe, a blowpipe pivoted on said carriage for swinging movement in a longitudinal plane with respect to said pipe, means for rotating said pipe, means for moving said carriage longitudinally of said pipe to cause said blowpipe to make a miter cut in the pipe, and mechanism for tilting said blowpipe about its pivot during the rotation of said pipe, said tilting mechanism comprising a rod connected to said carriage and a link interposed between said rod and said blowpipe to maintain a constant angle of bevel measured perpendicular to said miter cut.

6. In a pipe mitering and beveling machine,

mreunsitorssupporting :ra ipipeitoabe :;:cutforirotation about the'filcngitudlndl axis :of :the means for supportingablowpipeior:pivotalcnove- :merit laina wplane reritending i longitudinally avvith respect ?to said mine, a tra'ction 510'1181 in rolling engagement with:.-sa'iii pipe,;-a i disclin rolling :en-

'ga gem'ent with *said traction :roller, .andmeans "actuated by said disc 'for swirrging :saidiblowpipe in said plane comprising :'a 'link eccentrically rpivoted on said disc and :connected to the .blowpipe by a universal joint Lfor gradually lchanging the -inclinationof sa'id 'zblowpipe with :respect "to the longitudin'al "axis 'o'f (the pipe, to maintain the. inclination of said4blowpipe constant measureiizperpendicular to the miter cut.

'7 In a pipe mitering-machine, means for sup- --portin=g-:a* p'ipe to 'be cut for rotation about the 'l'ongitudinalfiaxis o'i the pipe, a frame pivoted intermediate its-ends on an axis-transverse'to the l'orrgitudinal'aXia-ot the pipe, rails on'- said frame substaritially 'parallel to 'the longitudinalaxis of eSa id the pipe, a carriage rolling on said rails, a blowepipe supported =at one el'ld o f said-carriage, and :means actuated in timed relation "to such rotaitionof the pipe for moving said carriage along ailsfor moving said blowpipe longitudinally a-of' ithe pipeas -the-pipe rotates to cause a miter mutrirr'dhea-riipe.

I 3.;11132, pipe miterin g machine, means for supporting a pipe to be ent for *rotation' about the longitudinal axis 'o'rthe pipe,-means for supipor-ting a I blowpipe for longitudinal movement I th' respect' to the p'ipega' rolling contact-zmember n -action.- engagement with the periphery of the pipe, means actuated by said -rolling contact tmember for causing suchiongitudina'l movement :iof :the blowpipeduring mitation of the pipe to acause aum'tter rout in the-pipe an actuator driven -.iby:.=sai'd; rollingrcontact member, a link "driven' by zzsai'd sactuatonand connected to theblovvpipe, and

,rarcoupling :intenposed between said actuator and .liblowpipe and 'conneoted to'said link for maintaini ing a :constan't angle of bevel perpen'dicular to said miter cut.

9. In a pipe mitering machine, pairs of rolls for supporting the pipe to be cut for rotation about the longitudinal axis of the pipe, means for supporting a blowpipe for longitudinal movement with respect to the pipe, means actuated in timed relation to such rotation for causing relative longitudinal movement of said nozzle and pipe during such rotation to cause a miter cut in the pipe, an actuator driven in timed relation to such relative rotation, a link driven by said actuator and connected to the blowpipe, and a coupling interposed between said actuator and blowpipe and connected to said link for maintaining a constant angle of bevel perpendicular to said miter out said blowpipe supporting and actuating means being adjustably mounted with respect to said pairs of rolls, whereby a pipe of any length can be positioned upon said rolls, after which said blowpipe supporting and actuating means may be set in position to out the pipe.

10. In a pipe mitering machine, means for supporting the pipe to be out for rotation about the longitudinal axis of the pipe, a frame mounted for movement toward and away from said pipe, means on said frame for supporting a blowpipe for longitudinal movement with respect to the pipe, a rolling contact member journaled in said frame and adapted to tractionally engage the periphery of the pipe when said frame is moved toward the pipe, means actuated by said rolling contact member for causing said longitudinal movement of said blowpipe as the pipe rotates to cause a miter cut in the pipe an actuator driven in timed relation to such relative rotation, a link driven by said actuator and connected to the blowpipe, and a coupling interposed between said actuator and blowpipe and connected to said link for maintaining a constant angle of bevel perpendicular to said miter cut.

11. In a pipe mitering and beveling machine, means for supporting a blowpipe for pivotal movement in a plane extending longitudinally of the pipe, means for causing relative rotation of said blowpipe supporting means and the pipe, means for reciprocating said blowpipe supporting means to cause a miter cut in the pipe, a reciprocating member for tilting the blowpipe to cut a bevel on the miter, and a compensating link interposed between said reciprocating member and said blowpipe to maintain a constant angle of bevel measured perpendicular to the miter out.

12. In a pipe mitering and beveling machine, means for supporting a blowpipe for pivotal movement in a plane extending longitudinally of the pipe, means for causing relative rotation of said blowpipe supporting means and the pipe, means for reciprocating said blowpipe supporting means to cause a miter cut in the pipe, a reciprocating member having a universal joint to the blowpipe for tilting the blowpipe to cut a bevel on the miter, and a rotary member for driving said reciprocating member to maintain a constant angle of bevel measured perpendicular to the miter out.

13. In a pipe mitering machine, means for causing relative rotation of a blowpipe nozzle and the pipe being out about the longitudinal axis of the pipe, means for causing relative longitudinal movement of said nozzle and pipe during such relative rotation in timed relation thereto to cause a miter cut in the pipe, an actuator driven in timed relation thereto, a link driven by said actuator and connected to the blowpipe, and a coupling interposed between said actuator and said nozzle and connected to said link for gradually changing the inclination of the blowpipe to provide a bevel edge for the miter cut.

14. Apparatus for cutting a varying angle bevel in pipe, comprising means for mounting a blowpipe nozzle for swinging movement about an axis substantially tangent to the pipe, means for causing relative rotation of said nozzle and the pipe about the longitudinal axis thereof, means for causing relative longitudinal movement of said nozzle and pipe during such relative rotation to cause a miter cut in the pipe, an actuator driven in timed relation to said relative rotation, a link driven by said actuator and connected to the blowpipe for causing inclination thereof during said relative rotation to cause a miter cut in the pipe, and a coupling interposed between said actuator and said nozzle and connected to said link for gradually changing the blowpipe inclination to provide a bevel edge for said miter out.

LLOYD W. YOUNG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,661,274 Steere et a1 Mar. 6, 1928 1,858,076 Douglass May 10, 1932 1,858,078 Douglass et a1 May 10, 1932 1,928,121 Anderson Sep. 26, 1933 1,954,549 Twigg et a1 Apr. 10, 1934 1,963,537 Tweit June 19, 1934 2,035,765 Schmidt Mar. 31, 1936 -2,384,128- Nation Sept. 4, 1945 FOREIGN PATENTS Number Country Date 135,962 Austria Dec. 27, 1933 

